Business Catalyst - Create, Read and Erase Cookie Javascript

function createCookie(name,value,days) {
   if (days) {
      var date = new Date();
      date.setTime(date.getTime()+(days*24*60*60*1000));
      var expires = "; expires="+date.toGMTString();
   }
   else var expires = "";
      document.cookie = name+"="+value+expires+"; path=/";
 }
 function readCookie(name) {
   var nameEQ = name + "=";
   var ca = document.cookie.split(';');
   for(var i=0;i < ca.length;i++) {
     var c = ca[i];
     while (c.charAt(0)==' ') c = c.substring(1,c.length);
        if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
     }
   return null;
 }

 function eraseCookie(name) {
  createCookie(name,"",-1);
 }

 createCookie('testcookie','valcookie',7);
 var cookie_value = readCookie('testcookie');
 alert('cookie value = '+cookie_value); //output cookie value valcookie
 eraseCookie('menard');
 cookie_value = readCookie('menard');
 alert('cookie value = '+cookie_value); //cookie value menard null